Genetic evidence of an evolutionarily conserved role for Nrf2 in the protection against oxidative stress

Katsuki Mukaigasa, Linh T.P. Nguyen, Li Li, Hitomi Nakajima, Masayuki Yamamoto, Makoto Kobayashi

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

Transcription factor Nrf2 is considered a master regulator of antioxidant defense in mammals. However, it is unclear whether this concept is applicable to nonmammalian vertebrates, because no animal model other than Nrf2 knockout mice has been generated to examine the effects of Nrf2 deficiency. Here, we characterized a recessive loss-of-function mutant of Nrf2 (nrf2fh318) in a lower vertebrate, the zebrafish (Danio rerio). In keeping with the findings in the mouse model, nrf2fh318 mutants exhibited reduced induction of the Nrf2 target genes in response to oxidative stress and electrophiles but were viable and fertile, and their embryos developed normally. The nrf2fh318 larvae displayed enhanced sensitivity to oxidative stress and electrophiles, especially peroxides, and pretreatment with an Nrf2-activating compound, sulforaphane, decreased peroxide-induced lethality in the wild type but not nrf2fh318 mutants, indicating that resistance to oxidative stress is highly dependent on Nrf2 functions. These results reveal an evolutionarily conserved role of vertebrate Nrf2 in protection against oxidative stress. Interestingly, there were no significant differences between wild-type and nrf2fh318 larvae with regard to their sensitivity to superoxide and singlet oxygen generators, suggesting that the importance of Nrf2 in oxidative stress protection varies based on the type of reactive oxygen species (ROS).

Original languageEnglish
Pages (from-to)4455-4461
Number of pages7
JournalMolecular and cellular biology
Volume32
Issue number21
DOIs
Publication statusPublished - 2012 Nov

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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